axi.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2017, 2018
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*/
#ifndef _AXI_H_
#define _AXI_H_
/**
* enum axi_size_t - Determine size of AXI transfer
* @AXI_SIZE_8: AXI sransfer is 8-bit wide
* @AXI_SIZE_16: AXI sransfer is 16-bit wide
* @AXI_SIZE_32: AXI sransfer is 32-bit wide
*/
enum axi_size_t {
AXI_SIZE_8,
AXI_SIZE_16,
AXI_SIZE_32,
};
struct axi_ops {
/**
* read() - Read a single value from a specified address on a AXI bus
* @dev: AXI bus to read from.
* @address: The address to read from.
* @data: Pointer to a variable that takes the data value read
* from the address on the AXI bus.
* @size: The size of the data to be read.
*
* Return: 0 if OK, -ve on error.
*/
int (*read)(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
/**
* write() - Write a single value to a specified address on a AXI bus
* @dev: AXI bus to write to.
* @address: The address to write to.
* @data: Pointer to the data value to be written to the address
* on the AXI bus.
* @size: The size of the data to write.
*
* Return 0 if OK, -ve on error.
*/
int (*write)(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
};
#define axi_get_ops(dev) ((struct axi_ops *)(dev)->driver->ops)
/**
* axi_read() - Read a single value from a specified address on a AXI bus
* @dev: AXI bus to read from.
* @address: The address to read from.
* @data: Pointer to a variable that takes the data value read from the
* address on the AXI bus.
* @size: The size of the data to write.
*
* Return: 0 if OK, -ve on error.
*/
int axi_read(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
/**
* axi_write() - Write a single value to a specified address on a AXI bus
* @dev: AXI bus to write to.
* @address: The address to write to.
* @data: Pointer to the data value to be written to the address on the
* AXI bus.
* @size: The size of the data to write.
*
* Return: 0 if OK, -ve on error.
*/
int axi_write(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
struct axi_emul_ops {
/**
* read() - Read a single value from a specified address on a AXI bus
* @dev: AXI bus to read from.
* @address: The address to read from.
* @data: Pointer to a variable that takes the data value read
* from the address on the AXI bus.
* @size: The size of the data to be read.
*
* Return: 0 if OK, -ve on error.
*/
int (*read)(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
/**
* write() - Write a single value to a specified address on a AXI bus
* @dev: AXI bus to write to.
* @address: The address to write to.
* @data: Pointer to the data value to be written to the address
* on the AXI bus.
* @size: The size of the data to write.
*
* Return: 0 if OK, -ve on error.
*/
int (*write)(struct udevice *dev, ulong address, void *data,
enum axi_size_t size);
/**
* get_store() - Get address of internal storage of a emulated AXI
* device
* @dev: Emulated AXI device to get the pointer of the internal
* storage for.
* @storep: Pointer to the internal storage of the emulated AXI
* device.
*
* Return: 0 if OK, -ve on error.
*/
int (*get_store)(struct udevice *dev, u8 **storep);
};
#endif